<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>getter</title>
</head>
<body>
  <script type="text/javascript">
    class Rectangle {
        // 补全代码
         constructor(height,width){
            this.height = height;
            this.width = width;
            this.area = height * width;
        }
    }
</script>
</body>
</html>